Automation System
A disadvantage of Numerical Control (NC) is:

the computer is not reliable
one operator is needed for each machine.
the tape and tape reader are not reliable
None of these
the machine tool can easily overheat

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Automation System
An aneroid barometer

can be used to measure gas or liquid flow rates
can measure only atmospheric pressure
measures pressure by sensing deflection of an evacuated chambers.
None of these
is very unreliable

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Automation System
A solenoid:

None of these
is widely used in industrial automation
is related to an aneroid
is spring operated
can be used only in de circuits

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